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A001423
as a simple table
n
a(n)
0
1
1
1
2
4
3
18
4
126
5
1160
6
15973
7
836021
8
1843120128
9
52989400714478
10
12418001077381302684
[1,1,4,18,126,1160,15973,836021,1843120128, 52989400714478,12418001077381302684]
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Last modified August 18 13:06 EDT 2024. Contains 375269 sequences. (Running on oeis4.)